Carbon attachment for typewriting machines



Jan. 6, 1925.

H. R. HOLMYARD CARBON ATTACHMENT FOR TYPEWRITING MACHINES Filed ov. 8,1923 eater-E HAROLD R.,HOLIVIYARD, OF WYOMING, OHIO, ASSIGNOR' TO:

SERVER COMPANY, OF GINCIIJIQ'ATI,

THE! orramrron cononro, A: CORPORATION on OHIO.

CARBON ATTacHMEN'rror. rvrnwarriue MACHINES.

Application filed November 8, 1923. Serial No. 673,553.

To all whomttmag/ concern:

Be it known that I, T-TAROLD'R. HOLMYARD, a citizen of the UnitedStates, residing at Wyoming, in the county of Hamilton and Stateof'Ohio, have invented" certain new and useful Improvements in CarbonAttachments for Typewriting Machines, of which the following is aspecification.

This invention relates to a carbon attachment for typewriting machinesand is designed to support a supply of carbon, preferably in the form ofa roll, so that it will always be in convenient position for use. It isillustrated in connection with a structure such as shown in a priorapplication Serial No. 639,321, filed May 16, 1923, Patent Number1,492,832 but certain features thereof are capable of use withattachments of different character.

In an attachment of the character illustrated, the carbon support isconnected to the carriage of the typewriting machine and travelstherewith. In certain types ofmachines, the whole carriage is shiftedvertically for writing in upper case characters. If the attachment ismounted to shift therewith, this adds considerable weight to thecarriage which would be objectionable.

An object of my invention is to provide means whereby the weight of theattachment will be substantially counter-balanced during the shiftingmovement of the carriage, so that there will be no noticeable increasein the weight thereof.

Other objects will be apparent from the following detailed descriptionand the appended claims.

In the drawings:

Figure 1 is a perspective view of the attachment in place embodying myinvention with the typewriting machine indicated in outline and only somuch of the attachment illustrated as will be sufficient to indicate thecharacter thereof.

Figure 2 is a rear View of the improvements constituting the subjectmatter of this invention.

Figure 3 is a bottom plan view of the spring and roller.

Figure 1 is a section on the line 4-4: of Figure 2.

A typewriting machine A which may be of any desired type but for thepurposes of this invention is generally one in which the whole carriageshifts vertically for case shift purposes, is shown merely in outline.

to which a portion in differentmachines; v The carbon supporting framecomprises two arms 1 to which is rivetedor otherwise rigidly'fastened aU-shap-ed member having a bottom portion2 andupstanding' arms 3 providedwith notches 4 in having a'base 7. The carbon roll Cis carried by theupper ends of the. uprights 6. The base 7 has av bearing 8 in whichfitsa rotatable latch member 9 adapted to hold the parts in the positionshown or, to be moved to allow the roll support to be folded, pins turnin downwardly at which time. the

the bearings 4. The roll support may also be tilted backwardly to permitthe. carbon.

upon which the attachment is used.

To the under side of the. base member 2 is attached a plate spring 13'which is fastened at one rivet or similar fastening 14. The opposite endof the spring is providediwith aslo-t 15 which engages aheaded rivet orbolt 16 fast upon the base 2. Since this endis free to slide, it isobvious that the spring may yield. The slot 15 will be made long enoughso that there will be no danger of accidental T carriage includes a rodB atthe rearithereof of the. attachment is fastened. The shape of thisrod B will vary.

which fit pins 5 carried by uprights 6 of a U -shaped member whichengages will be shaped to conform with the rail B ,of-the machineend tothe member 2, by a.

disengagement of this end of the spring from the rivet 16. Integralwith, or fastened to the spring 13 are 'downturned ears 17 between whichis pivoted a grooved roller 18.

This roller 18 is adapted to run upon a track rail 19 which is fastenedto the frame of the typewriting machine in the following manner.Attached by screws or similar fastenings to the frame and extendingrearwardly are two arms 20 which have upturned ears 21 at their rearends, and said ears are provided with elongated slots 22. Attached byrivets or suitable fastenings to the ends of the track rail 19 are shortmembers 23. Headed screws 2% pass through the slots 22 and screw intothe members 28, thus permitting an adjustmentof the members 23 withrelation to the ears 21 and thereby varying the normal height of therail 19. The ears may be made long enough to provide for any desiredrange of adjustment.

While not essential to the use of the spring 13, this adjustment of thetrack rail is important and cooperates therewith in that it permits theparts to be so adjusted that the spring is somewhat tensioned in thelower position of the carriage, and when it is shifted upwardly in theusual manner for printing capitals, the spring will expand andsubstantially counterbalance the weight of the carriage. The use of theattachment on machines of this character is therefore possible withoutadding noticeably to the weight of the carriage when moved by the shiftkey.

It is obvious that different forms of counterbalancing spring may beused; also that the spring support and adjustable track rail may be usedtogether or separately with carbon carrying attachments of difierenttypes; and that they may also he used for supporting a roll of paperother than carbon. Various detail changes may be made without departingfrom the spirit of the invention which is to be regarded as limited onlyby the scope of the appended claims.

I claim as my invention:

1 A carbon roll attachment for typewriting machines comprising a trackrail, a roll supporting frame attached to the carriage of thetypewriting machine, and resilient supporting means carried by saidframe and travelling upon said t 'ack rail.

2. A paper supporting attachment for typewriting machines comprising atrack rail attached to the frame of the machine, a paper supportingframe connected to the carriage of the typewriting machine to traveltherewith, and resilient supporting means therefor carried by the latterframe and travelling upon said track.

3. A carbon atachment for typewriting machines embodying a carriagebodily shiftable for case printing comprising a track rail, a carbonsupport connected to the carriage to travel therewith, and means carriedby the support and travelling on the rail which include a spring tosubstantially counterbalance the weight of the support when the carriageis shifted.

4-. 11 carbon attachment for typewriting machines embodying a carriagebodily shiftable for case printing comprising a track on the frame ofthe machine, a carbon support connected to the carriage to travel andshift therewith, and means for conterbalancing the weight of the supportwhen the carriage is shifted.

5. A. carbon attachment for typewriting machines comprising a track onthe machine frame, a carbon support connected to the carriage of themachine to travel therewith and including a base, a spring attached tosaid base, and a roller carried by said spring and running upon saidtrack.

6. A carbon attachment for typewriting machines comprising a track onthe machine frame, a carbon support connected to the carriage of themachine to travel'therewith and comprising a base, a flat spring rigidlyattached at one end to said base, and a. roller carried by said springand running on said track.

7. A carbon attachment for typewriting machines comprising a track onthe. machine frame, a carbon support connected to the carriage of themachine to travel therewith and comprising a base, a flat bowed springfastened at one end to the base and having a sliding engagementtherewith at its other end, and means supported by said spring andrunning on said track.

8. A paper supporting attachment for typewriting machines comprising atrack rail on the frame of the machine, means whereby the heightof thetrack rail may be adjusted, a. paper supporting frame connected to thecarriage of the machine to travel therewith, and resiliently supportedmeans carried by the latter frame and running on said track.

In testimony Wherof I affix my signature.

HAROLD R. HOLMYARD.

